I wanted to try a different way of operating the Z Axis so I setup a tower using 40x40. In the end it worked excellently and can easily print 60mm/s with 150mm/s travels. The coreXY is a very cool kinematic, and you can get some pretty great speed and accuracy. The main issue is the fact your Steps/mm are doubled, so the lower end motors don't like it at high speeds.

Moveable Lead CNC1010 build with handles on four corners. Everything fits on one sheet of cut out 4x8 plywood

Similar to C-Beam Machine build, but with inverted Y-axis assembly to shield drive screw. Integrated XZ gantry can be fixed to any solid surface. Build dimensions are 36" x 36" x 6".